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Oct 14, 2021, 06:44 PM
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rockom's Avatar
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Micro Glider Ideas


I recall seeing some posts a while back of a micro balsa build using UMX brushless electronics. This would make a nice winter build. I might even be able to test it out inside. Any ideas? Suggestions? Anyone make a kit that would be suited for this? I already have a donor UMX Beast.

-Rocko
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Oct 14, 2021, 11:05 PM
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rockom's Avatar
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The beast has a 6 channel receiver. I think something with ailerons and flaps would be fun.

-Rocko
Oct 14, 2021, 11:34 PM
B for Bruce
BMatthews's Avatar
Weight counts a lot on the smaller designs. I'd keep it simple if you're looking at the very small stuff if you expect it to ride any lift.

There's been a pretty good number of micro glider designs over the past couple of years. A few that I got from a fast search for "micro glider" in the Sailplane Talk forum....

https://www.rcgroups.com/forums/show...-Micro-Sagitta
https://www.rcgroups.com/forums/show...ro-Gentle-Lady
https://www.rcgroups.com/forums/show...-Micro-Drifter
https://www.rcgroups.com/forums/show...1-Micro-Aquila
https://www.rcgroups.com/forums/show...Micro-Wanderer

A lot of these are from the member Alien_tech who has made some laser cut kits or semi kits for his designs and has been selling them to folks.

If you're a scratch builder than the world is your oyster. Be warned that the following link has a total of 1466 plans for gliders that are free flight or RC. So lay in a good stock of snacks and catheterize yourself and prepare for a long trip down the rabbit hole

A lot of the free flight stuff could be easily converted to RC gliders. If you don't want to do a stick and tissue built fuselages then there's some pretty easy rules for converting the designs over to sheet balsa construction. But you need to cut out all your own parts for these.

https://outerzone.co.uk/advanced/tag...asp?GL=1&S1=27

On top of that there's a lot of old free flight gliders or early RC gliders that are either already pretty small or which could be printed out
Oct 15, 2021, 06:31 AM
I just want to go fly!
walter3rd's Avatar
What’s the wingspan you are shooting for?
Oct 15, 2021, 06:52 AM
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rockom's Avatar
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Originally Posted by walter3rd
What’s the wingspan you are shooting for?
36" to 48" would be great. I've been looking at the Micro Drifter and BOT from J&H Aerospace but just wasn't sure if that would be a good match for my hardware. No ailerons or flaps but, not needed for these. I really like flying my Micro Radian but I want something in balsa with some classic balsa look a feel. Plus it's been years since I really got into a kit or scratch build. I'm due to make some dust.

My other gliders:
Sig Riser on High Start
Radio Pro
Multiplex Fun Glider
Great Planes Kunai

-Rocko
Oct 15, 2021, 08:22 AM
Registered User
I kind of doubt the UMX motor and prop could handle a 36 or 48 inch model. Isn't the UMX Radian only 50 grams or so? You might look at the Bug DLG, but thin the airfoils, use Drela foils, etc. Of course, with an open wing structure you're not going to get nominal airfoils except at the ribs. I think the Lightnin Bug, which I think is too large for UMX gear, has the AG37 for an option, and that might work. The round carbon spar is inefficient. You could probably make a conventional spar which was stiffer, stronger, and/or lighter. For a model this small, the spar would also be quite small.

There are some P-30 designs which might work, and could probably come out at an acceptable weight, but you'd probably want to use less camber in the airfoils. It would be best if the fin was all the way at the back of the model, and it might need to be a little larger than you'd use on a ff model.
Oct 15, 2021, 08:46 AM
I don't want to "Switch Now"
pmackenzie's Avatar
Another option:

https://www.rcgroups.com/forums/show...i-1M-RC-Glider

https://www.aviationtoys.nl/a-658203...ts/cxres-mini/

I have one on the way,I will probably do an electric fuse as well as the pure glider one.
Oct 15, 2021, 09:18 AM
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rockom's Avatar
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Quote:
Originally Posted by lincoln
I kind of doubt the UMX motor and prop could handle a 36 or 48 inch model

You could definitely be right however, not all UMX are the same.
The UMX radian gear would definitely NOT work. The UMX Beast uses a 180 size brushless on 2 cells. Other than 2500kv, I can't find any specs on this motor or the max current capability of the ESC.

edit: The UMX Pitts uses a 3000kv version of this motor.

-Rocko
Last edited by rockom; Oct 15, 2021 at 09:26 AM. Reason: more info
Oct 15, 2021, 02:06 PM
I just want to go fly!
walter3rd's Avatar
not sure about the gear compatibility but im loving my j and h bot and drifter build. very nice and like you i wanted balsa of my own build as opposed to foam. good luck. im also going to build the 48 inch gentle lady too. all 3 should be great small space gliders. fingers crossed.
Last edited by walter3rd; Oct 16, 2021 at 07:39 AM.
Oct 16, 2021, 12:33 AM
Registered User
Wha t a about a Yellow Jacket 1.5 kit?
https://sonoranlaserart.com/product/...-f5k-electric/
I built one, flys great, great kit, I was really amazed how small the motor was, I think it’s in your ballpark….
Oct 16, 2021, 01:39 PM
Registered User
I didn't realize there were other sizes of motor used in UMX models. The old GWS 180 geared motor (aka IPS) could handle a 7 ounce model that wasn't terribly. I don't know how well that correlates with a "180" brushless.
Oct 16, 2021, 02:51 PM
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rockom's Avatar
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I heard back from Josh at J&H Aerospace. He said they put UMX gear in the Micro BOT but the Rudder was only marginal. The Micro BOT demands a little more than the UMX gear can provide.
Oct 16, 2021, 03:11 PM
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rockom's Avatar
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Quote:
Originally Posted by asat
Wha t a about a Yellow Jacket 1.5 kit?
Very nice!
Oct 16, 2021, 03:56 PM
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Quote:
Originally Posted by rockom
I heard back from Josh at J&H Aerospace. He said they put UMX gear in the Micro BOT but the Rudder was only marginal. The Micro BOT demands a little more than the UMX gear can provide.
One could minimize any friction in the hinges, maybe even make them bearings, and then use either a servo tab or a balanced rudder (i.e. with part of rudder ahead of the hinge line.
Oct 16, 2021, 04:57 PM
I just want to go fly!
walter3rd's Avatar
I’m having good luck with film hinges on my little guys. Takes very little effort to move: so far so good.


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